745039891 has 4 divisors (see below), whose sum is σ = 752273392. Its totient is φ = 737806392.

The previous prime is 745039879. The next prime is 745039901. The reversal of 745039891 is 198930547.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198930547 = 2677 ⋅74311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745039891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745039811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616596 + ... + 3616801.

It is an arithmetic number, because the mean of its divisors is an integer number (188068348).

Almost surely, 2^745039891 is an apocalyptic number.

745039891 is a deficient number, since it is larger than the sum of its proper divisors (7233501).

745039891 is a wasteful number, since it uses less digits than its factorization.

745039891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7233500.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 745039891 is about 27295.4188647106. The cubic root of 745039891 is about 906.5529499975.

The spelling of 745039891 in words is "seven hundred forty-five million, thirty-nine thousand, eight hundred ninety-one".